Friction-spring.



G. L. HARVEY.

FRICTION SPRING. APPLIOATIGN FILED N0J'.19,1906

Patented Sept. 23, 1913.

2 SHEETS-SHEET 1.

G. L. HARVEY.

FRICTION SPRING.

APPLIUAT'ION FILED NuV.19,1006.

m 7 u W M a Wu P j Z 2 K. W m y m m M GEORGE LYON HARVEY, OF CHICAGO. ILLINOIS,

FRICTION-SPRING.

Specification of Letters Iatent.

Patented Sept. 23, I 913.

Application filed November 19, 1906. Serial No. 344,151.

0 (NZ whom it may concern.

Be it known that I, Gnonen L; I'IARVEY, a citizen of the United States of America, residing at Chicago, in the county of Cook and State of Illinois, United States of America, have invented certain new and useful Improvements in Friction-Springs, of which the following is a specification, reference being had therein to the accompanying drawings.

The invention relates to new and useful improvements in friction springs, and consists particularly in the construction of a spring member which is resilient transversely to its longitudinal axis, combined with a spring member resilient longitudinall of its axis, the parts being combined so t at one member w1ll frictionally engage the other, and so that the first mentioned member will be expanded by such frictional engagement and the parts will be returned to their initial position by the action of the two members, all as more fully hereinafter described and particularly pointed out in the claims. f

In the drawings, Figure 1 is a side elevation of my improved friction spring; Fig. 2 is a vertical central cross section thereof; Fig. 3 is a plan view; Fig. 4 is a section similar to Fig. 1 in a slightly modified form; and Fig. 5 is an elevation of another form of spring.

A is a split sleeve or ring of spring metal, and preferably tapering from one end to the other.

B is a helical spring, having its outer face conforming to and fitting within the inner face of the member A. The helical spring B I have shown as formed of a bar of square metal which will not only give a plane outer surface to contact the inner surface of the member A, but also, when the spring is fully compressed, will give a solid center to take the shocks. It is not essential that this helical member should be square, but it is desirable that the duter face should be a plane surface, so as to give the greatest possible friction to the split member A.

As will be seen from the drawing, the inner member extends above the outer member the distance which it is desired to have the spring play, the load being preferably applied at the point D, and the point E being the point of support, although this order may be reversed.

At the lower end or the small end I conncct the split member with the helical member b any suitable means. I have shown in the rawing a bolt F, passing through the two. In this construction I have also shown the lower coils of the helical member wound tight together, as there is little if any motion to the spring at that point.

The parts being thus constructed, and the load applied as at D, for instance as between a railroad car and its truck, as the car descends or the truck rises the helical member will be compressed and be pushed into the tapering split member, frictionally engaging the sides thereof and expanding the split member, both by the conical shape of the parts and also by the natural expansion of the helical member under load. As soon as the load is released the resiliency of the helical member will return the parts to their initial position, the bolt preventing the parts from slipping in relation to one another.

Instead of using a single split member, I may make this member of two or more parts, as shown in Fig. 4, in which I have shown a second split member H applied outside the member A.

Instead of making the outer member split the entire distance, inasmuch as I preferably wind the lower coils tight together it is obvious that the slit or split may be but part way down, and I may, if light effects are de sired, make a number of slits in this outer member, as in Fig. 5 I have shown an outer member formed of a tapering tube I with a number of slits a in the upper portion thereof.

What I claim as my invention is- 1. A spring comprising a.tubular tapering split member, and a tapering helical spring fitting therein.

2. spring comprising a tubular ing split member, and a tapering spring fitting therein, said spring 1 plane outer face.

3. A spring comprising a tubular split member, a helical spring fitting therein, and means for locking the one end of the spring and one end of the split member together.

4. A spring comprising a multiple of tapering split members and a tapering helical spring fitting therein.

5. A spring comprising a multiple of a tubular split taperlng resilient member in frictional engagement with an endwise compressible spring member.

6. In a friction device an endwise comtaperhelical aving a pressible member of varying external diameter and a resilient drum.

7. In .a friction device an endwise compressible member of varying external diameter, and a resilient drum and normally in loose contact with the first member and brought into close frictional contact with said first member on compression of said member.

8. A friction device and endvvise compressible frictional memberof varying diameter from end to end and a drum fitting said members, the drum cooperating to have frictional end resilient engagement.

9. In a friction device an endvvise compressible tapered member and a resilient novaeve yieldlng drum fitting said member and 1 having frictional engagement there with,

substantially as described.

10. A spring comprising a tubular member resilient transverse to its longitudinal axis, and a spring member resilient on the line of its longitudinal axis positioned within and frictionally engaging the tubular member and adapted under compression to expand the latter.

In testimony whereof I afix my signature in presence of two witnesses. Y

GEORGE LYON HARVEY.

Witnesses:

ARTHUR V. BROWN, EARL S. SMITH. 

